Libav
time.c
Go to the documentation of this file.
1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * Libav is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 
21 #include <stddef.h>
22 #include <stdint.h>
23 #include <time.h>
24 #if HAVE_GETTIMEOFDAY
25 #include <sys/time.h>
26 #endif
27 #if HAVE_UNISTD_H
28 #include <unistd.h>
29 #endif
30 #if HAVE_WINDOWS_H
31 #include <windows.h>
32 #endif
33 
34 #include "time.h"
35 #include "error.h"
36 
37 int64_t av_gettime(void)
38 {
39 #if HAVE_GETTIMEOFDAY
40  struct timeval tv;
41  gettimeofday(&tv, NULL);
42  return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
43 #elif HAVE_GETSYSTEMTIMEASFILETIME
44  FILETIME ft;
45  int64_t t;
46  GetSystemTimeAsFileTime(&ft);
47  t = (int64_t)ft.dwHighDateTime << 32 | ft.dwLowDateTime;
48  return t / 10 - 11644473600000000; /* Jan 1, 1601 */
49 #else
50  return -1;
51 #endif
52 }
53 
54 int av_usleep(unsigned usec)
55 {
56 #if HAVE_NANOSLEEP
57  struct timespec ts = { usec / 1000000, usec % 1000000 * 1000 };
58  while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
59  return 0;
60 #elif HAVE_USLEEP
61  return usleep(usec);
62 #elif HAVE_SLEEP
63  Sleep(usec / 1000);
64  return 0;
65 #else
66  return AVERROR(ENOSYS);
67 #endif
68 }
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:54
error code definitions
#define AVERROR(e)
Definition: error.h:43
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:37
NULL
Definition: eval.c:55